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O-Ring Size Chart

With our O-ring size charts, you can hold up your O-ring against the chart and determine the size of your imperial O-ring. This chart includes sizes from O-ring series O, 1, 2, 3, 4, as well as O-rings for tube fitting bosses. Our O-ring size charts also offer information on groove design, material, and Hi-Tech Seals’ manufacturing capabilities.

Pi Tape® is used to determine the imperial or metric size of an O-ring. Determine the cross section or series of the O-ring using the cross section graphics. Then unwind the Pi Tape® on the inside diameter of the O-ring to determine the imperial part number or the metric inside diameter.

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